Glass shader. How can I get rid of the reflection in the glass?
Glass is reflective, so if you want to completely get rid of the reflections it won't look like glass anymore.  This can be done by using a refraction shader which only passes light through and does not reflect any rays.  If you want to just tone down the reflections you can mix a refraction shader with a glossy shader sharing the same parameters.

Below is shown an example of 100% glass, 20% glass and 0% glass respectively.

This may make your render look undesirable in other manners however as it will no longer be very physically accurate.  If this is the case, I suggest playing with the angle of your camera and/or whatever is being reflected in order to have it not block your view (as you may sometimes do in real life to look through a glaring object).